Additionally, ensure that you have issued and kept records of all required notices.

LLC is VERY IMPORTANT to organize in the correct states that don’t require formal records to maintain separation between LLC and personal.  

As a new flipper with no experience Hard money can be really expensive that's why its best to try that approach to partner up. 

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Egress will be required and depending on your municipality you may need rental license or permit.

I'm guessing the reason they get away with this is because they know how expensive it is to hire a lawyer to get rid of them.

Upfront expenses and monthly payments must be considered when calculating the return on your investment.EXAMPLEYou cash out $100,000 of your equity and use this as a downpayment on a $400,000 investment property.

Consulting with financial and legal experts ensures that both the sale and the subsequent purchase align with legal requirements and your personal financial goals.

Recommend you speak with a tax professional about how many days you can rent it out before you lose 2nd home classification and have to call it a rental.This reclassification may affect your mortgage 2nd home requirements.

Create a simple spreadsheet or written list to compare the features of each and identify the ones that align with your requirements.